CN107701221B - High negative pressure pipeline gas extraction metering device and use method thereof - Google Patents
High negative pressure pipeline gas extraction metering device and use method thereof Download PDFInfo
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- CN107701221B CN107701221B CN201710922998.4A CN201710922998A CN107701221B CN 107701221 B CN107701221 B CN 107701221B CN 201710922998 A CN201710922998 A CN 201710922998A CN 107701221 B CN107701221 B CN 107701221B
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- 238000000605 extraction Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 94
- 238000005553 drilling Methods 0.000 claims abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 230000005484 gravity Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims 1
- 238000011105 stabilization Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 75
- 238000005259 measurement Methods 0.000 abstract description 11
- 239000003245 coal Substances 0.000 abstract description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 6
- 230000008030 elimination Effects 0.000 abstract 1
- 238000003379 elimination reaction Methods 0.000 abstract 1
- 238000011156 evaluation Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000004047 hole gas Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Geophysics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Pipeline Systems (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
Abstract
The invention belongs to the technical field of coal mine safety, and particularly relates to a high negative pressure pipeline gas extraction metering device and a use method thereof. A high negative pressure pipeline gas extraction metering method and device comprises a gas extraction pipe, a flow guide pipe, a telescopic valve sleeve and a metering device, wherein the metering device consists of a pipeline, a water storage tank and a gas meter. The invention utilizes the telescopic valve sleeve to slowly open the gas inlet and the gas outlet of the gas meter, can be used for measuring methane flow in underground high negative pressure gas extraction drilling holes and pipelines, is suitable for water-free drilling pipelines and water-bearing drilling pipelines, can not only increase the resistance of a gas extraction system, but also reduce the resistance of the gas extraction system in the measurement of the gas flow, realizes the accurate measurement of the gas flow, provides an accurate metering method and equipment for gas extraction metering and coal seam gas outburst elimination evaluation, has a promotion effect on coal mine safety exploitation, and can also be applied to the flow measurement of other gases except methane in underground and ground high negative pressure pipelines.
Description
Technical Field
The invention belongs to the technical field of coal mine safety, and particularly relates to a high negative pressure pipeline gas extraction metering device and a use method thereof.
Background
The coal is produced in China, the coalbed occurrence structure is complex, and the characteristics of high gas, high content and low permeability exist, so that sixteen-character guidelines for gas control are required to be strictly executed in order to safely and effectively mine coal: reliable ventilation, standard extraction, effective monitoring and in-place management. The gas extraction is the strategy of controlling the root cause of the gas prevention and the treatment of the coal mine, whether the extraction reaches the standard or not, and the extraction measurement must be strictly and accurately carried out, so that the extraction measurement is very critical, the existing gas flow measurement methods, such as vortex shedding flowmeter method and orifice plate flowmeter method, are very much, and because certain moisture exists in the air flow, the two methods are easy to corrode, and the problems of increasing pipe network resistance and large measurement error exist, so that the method is not suitable for single-hole gas extraction flow measurement.
The gas meter is the most convenient gas metering device used at home and abroad, the metering is very accurate, the gas meter is frequently used in a home kitchen, but the gas meter is also widely used for natural gas flow measurement of underground coal mine holes, but the gas meter can only be used for positive pressure pipeline metering, and the gas meter is not used for negative pressure pipeline metering successfully by many people due to the structure and the like, so that the device for high negative pressure pipeline gas extraction metering is necessary to be invented, the gas meter air inlet and air outlet can be ensured to be opened slowly at the same time, the device can be used for measuring other gases of other high (low) negative pressure pipelines, and is suitable for water-free drilling and water-free drilling, and in the gas flow measurement, the resistance of an extraction system is not increased, and the resistance of the extraction system is also reduced, thereby achieving the accurate measurement of the gas flow.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a high negative pressure pipeline gas extraction metering method and device, which can ensure that an air inlet and an air outlet of a gas meter are slowly opened simultaneously, are suitable for water-free drilling and water drilling, and can reduce the resistance of an extraction system, thereby achieving accurate measurement of gas flow.
The invention adopts the technical proposal for solving the technical problems that:
the high negative pressure pipeline gas extraction metering device is characterized by comprising three parts of a guide pipe fitting (3), a telescopic valve sleeve (4) and a metering device (5), and is connected into a gas extraction system through upper and lower ports of the guide pipe fitting; the utility model provides a gas meter (56) of gas extraction system, including water storage tank (51), third pipeline (52), gas meter (54) are connected in water storage tank (51), first pipeline (52) are connected in water storage tank (54), second pipeline (7) are last to be provided with second valve (42), the both ends of expansion valve cover (4) overlap respectively in first valve (41) and second valve (42) for open simultaneously or close simultaneously first pipeline (6) and second pipeline (7), metering device (5) are including storage water tank (51), third pipeline (52), gas meter (54), first pipeline is connected in metering device's storage water tank (51), gas meter (51) are connected in third pipeline (52), second pipeline (7) are connected in water storage tank (54) of metering device, gas meter (54) are provided with to water storage tank (51).
Further, the water conservancy diversion pipe fitting includes honeycomb duct (31) and iron stopper joint (32), first plug joint (33), second plug joint (34), honeycomb duct valve (35) that set up on the honeycomb duct, iron stopper joint (32) seal and are located first plug joint (33) top, honeycomb duct valve (35) are located between first plug joint (33) and second plug joint (34), first plug joint (33) are connected with first pipeline (6), second plug joint (34) are connected with second pipeline (7).
Further, the telescopic valve sleeve (4) comprises a first valve sleeve (43), a second valve sleeve (44), a first screw (45), a second screw (46) and a sleeve (47), wherein an internal thread (48) is arranged in the sleeve (47), the first valve sleeve (43) is integrated with the first screw (45) and is connected to the upper end of the sleeve through the first screw (45), the first valve sleeve (43) is connected with a first valve (41) located on a first pipeline, the second valve sleeve (44) is integrated with the second screw (46), and is connected to the lower end of the sleeve through the second screw (46), and the second valve sleeve (44) is connected with a second valve (42) located on a second pipeline.
The use method of the high negative pressure pipeline gas extraction metering device comprises the following steps of:
firstly, checking whether water exists in a water storage tank (51), opening a water discharge valve (56) of the water storage tank, if water flows out of the water storage tank (51), waiting for the water in the water storage tank (51) to be discharged, and closing the water discharge valve (56) of the water storage tank; if no water flows out of the water storage tank (51), a water discharge valve (56) of the water storage tank can be directly closed;
closing the first valve (41) and the second valve (42), connecting the first pipeline (6) with the first rubber plug connector (33), and connecting the second pipeline (7) with the second rubber plug connector (34);
thirdly, a first valve sleeve (43) of the telescopic valve sleeve (4) is connected with the first valve (41) in a matched mode, a second valve sleeve (44) is connected with the second valve (42) in a matched mode, so that the telescopic valve sleeve (4) can simultaneously control the opening and closing of the first valve (41) and the second valve (42), and the telescopic valve sleeve (4) can be stably installed by means of the telescopic action of a first screw (45) and a second screw (46) in a sleeve (47) and the adjustment of the distance;
fourth, the flow guiding pipe valve (35) is closed, the middle part of the telescopic valve sleeve (4) is held by hands, and the telescopic valve sleeve is slowly rotated, so that the first valve (41) and the second valve (42) are simultaneously opened, the air flow in the drilling hole passes through the first pipeline (6), the water storage tank (51) is provided, if water is contained in the air flow, when the air flow flows through the water storage tank (51), the water in the air flow is settled in the water storage tank (51) due to the action of gravity, and the air flow becomes anhydrous air flow, and then returns to the flow guiding pipe through the third pipeline (52) and the gas meter (54) through the second pipeline (7);
fifthly, observing the reading of the gas meter, and after the rotor rotation of the gas meter is stable, recording the initial reading x 1 Simultaneously, the stopwatch is started, the recording time is 5min, and at the moment of 5min, a final reading x is recorded 2 Thus, the gas extraction amount (m) in the negative pressure pipeline can be calculated 3 /min), namely (x) 1 -x 2 )/5；
Step six, after the test is finished, the middle part of the telescopic valve sleeve (4) is held by hands and slowly rotated, so that the first valve (41) and the second valve (42) are closed simultaneously, the connection between the first pipeline (6) and the first rubber plug connector (33) is opened, the connection between the second pipeline (7) and the second rubber plug connector (34) is opened, the first rubber plug cover (38) is covered on the first rubber plug connector (33), and the second rubber plug cover (39) is covered on the second rubber plug connector (34);
seventh, the flow guide pipe valve (35) is opened, at the moment, air flow directly enters a main pipe of the gas extraction system from the gas extraction pipe, the valve (56) of the water storage tank is opened, water in the water storage tank is discharged, and then the valve (56) of the water storage tank is closed for the next standby.
Compared with the prior art, the invention has the following beneficial effects: the invention utilizes the telescopic valve sleeve to slowly open the gas inlet and the gas outlet of the gas meter, and can be used for measuring other gases of other high (low) negative pressure pipelines, thereby being applicable to water-free drilling and water-bearing drilling.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the present invention.
Fig. 2 is a schematic structural view of a flow guiding pipe in a closed state in the present invention.
Fig. 3 is a schematic cross-sectional view of a telescopic valve housing according to the present invention.
FIG. 4 is a schematic diagram of the gas flow in the state of use of the present invention.
Description of the embodiments
The present invention will be described in further detail with reference to examples, but embodiments of the present invention are not limited thereto.
As shown in fig. 1, the high negative pressure pipeline gas extraction metering device consists of three parts, namely a guide pipe fitting 3, a telescopic valve sleeve 4 and a metering device 5, and is connected into a gas extraction system through upper and lower ports of the guide pipe fitting; the upper port 36 of the guide pipe fitting is communicated with the gas extraction pipe 1 of the gas extraction system through threads, and the lower port 37 of the guide pipe fitting is communicated with the main pipe 2 of the gas extraction system through threads; the water guiding pipe fitting 3 is communicated with the metering device 5 through a first pipeline 6 and a second pipeline 7, so that gas flowing through the metering device forms a loop, the metering device 5 comprises a water storage tank 51, a third pipeline 52 and a gas meter 54, the first pipeline is connected with the water storage tank 51 of the metering device, the water storage tank 51 is connected with the gas meter 54 through the third pipeline 52, the second pipeline 7 is connected with the gas meter 54 of the metering device, and a water discharging valve 56 is arranged at the bottom of the water storage tank 51.
The diversion pipe fitting comprises a diversion pipe 31, an iron plug connector 32, a first rubber plug connector 33, a second rubber plug connector 34 and a diversion pipe valve 35, wherein the iron plug connector 32 is arranged on the diversion pipe, the iron plug connector 32 is closed and is positioned above the first rubber plug connector 33, the diversion pipe valve 35 is positioned between the first rubber plug connector 33 and the second rubber plug connector 34, the first rubber plug connector 33 is connected with a first pipeline 6, the second rubber plug connector 34 is connected with a second pipeline 7, a first rubber plug cover 38 can be used for plugging when the first rubber plug connector 33 is not connected with the first pipeline 6, a second rubber plug cover 39 can be used for plugging when the second rubber plug connector 34 is not connected with the second pipeline 7, and at the moment, gas flow directly enters a dry pipe 2 of a gas extraction system from the gas extraction pipe 1 as shown in fig. 2.
The two ends of the telescopic valve sleeve 4 are respectively sleeved on a first valve 41 and a second valve 42 which are positioned on a first pipeline, the positions of the first valve 41 and the second valve 42 are opposite, the telescopic valve sleeve 4 is used for simultaneously opening or simultaneously closing the first pipeline 6 and the second pipeline 7, as shown in fig. 3, the telescopic valve sleeve 4 comprises a first valve sleeve 43, a second valve sleeve 44, a first screw 45, a second screw 46 and a sleeve 47, an internal thread 48 is arranged in the sleeve 47, the first valve sleeve 43 is integrated with the first screw 45 and is connected with the upper end of the sleeve through the first screw 45, the first valve sleeve 43 is connected with the first valve 41 positioned on the first pipeline, the second valve sleeve 44 is integrated with the second screw 46 and is connected with the lower end of the sleeve through the second screw 46, and the second valve sleeve 44 is connected with the second valve 42 positioned on the second pipeline;
the use method of the high negative pressure pipeline gas extraction metering device comprises the following steps of:
firstly, checking whether water exists in the water storage tank 51, opening a water discharge valve 56 of the water storage tank, if water flows out of the water storage tank 51, waiting for the water in the water storage tank 51 to be discharged, and closing the water discharge valve 56 of the water storage tank; if no water flows out of the water storage tank 51, the water drain valve 56 of the water storage tank can be directly closed;
closing the first valve 41 and the second valve 42, connecting the first pipeline 6 with the first rubber plug connector 33, and connecting the second pipeline 7 with the second rubber plug connector 34;
thirdly, the first valve sleeve 43 of the telescopic valve sleeve 4 is connected with the first valve 41 in a matched manner, the second valve sleeve 44 is connected with the second valve 42 in a matched manner, so that the telescopic valve sleeve 4 can simultaneously control the opening and closing of the first valve 41 and the second valve 42, and the telescopic valve sleeve 4 can be stably installed by stretching and retracting the first screw 45 and the second screw 46 in the sleeve 47 and adjusting the distance;
fourth, the flow guiding pipe valve 35 is closed, the middle part of the telescopic valve sleeve 4 is held by hand and slowly rotated, so that the first valve 41 and the second valve 42 are simultaneously opened, the air flow in the drill hole passes through the first pipeline 6, the water storage tank 51, if water is contained in the air flow, the water in the air flow is settled in the water storage tank 51 due to the action of gravity when the air flow flows through the water storage tank 51, the air flow becomes anhydrous air flow, and the anhydrous air flow returns to the flow guiding pipe through the third pipeline 52 and the gas meter 54 and passes through the second pipeline 7, as shown in fig. 4;
fifthly, observing the reading of the gas meter, and after the rotor rotation of the gas meter is stable, recording the initial reading x 1 Simultaneously, the stopwatch is started, the recording time is 5min, and at the moment of 5min, a final reading x is recorded 2 Thus, the gas extraction amount (m) in the negative pressure pipeline can be calculated 3 And/min) with a calculation formula of (x) 1 -x 2 )/5；
Step six, after the test is finished, the middle part of the telescopic valve sleeve 4 is held by hands and slowly rotated, so that the first valve 41 and the second valve 42 are closed simultaneously, the connection between the first pipeline 6 and the first rubber plug connector 33 is opened, the connection between the second pipeline 7 and the second rubber plug connector 34 is opened, the first rubber plug cover 38 is covered on the first rubber plug connector 33, and the second rubber plug cover 39 is covered on the second rubber plug connector 34;
seventh, the draft tube valve 35 is opened, at this time, air flow directly enters the main tube of the gas extraction system from the gas extraction tube, the valve 56 of the water storage tank is opened, water in the water storage tank is discharged, and then the valve 56 of the water storage tank is closed for the next standby.
The present invention is not limited to the preferred embodiments described above, and any person skilled in the art will recognize that equivalent embodiments with modifications or variations can be made without departing from the scope of the invention.
Claims (4)
1. The high negative pressure pipeline gas extraction metering device is characterized by comprising three parts of a guide pipe fitting (3), a telescopic valve sleeve (4) and a metering device (5), and is connected into a gas extraction system through upper and lower ports of the guide pipe fitting; the utility model provides a gas meter (56) of gas extraction system, including water storage tank (51), third pipeline (52), gas meter (54) are connected in water storage tank (51), first pipeline (52) are connected in water storage tank (54), second pipeline (7) are last to be provided with second valve (42), the both ends of expansion valve cover (4) overlap respectively in first valve (41) and second valve (42) for open simultaneously or close simultaneously first pipeline (6) and second pipeline (7), metering device (5) are including storage water tank (51), third pipeline (52), gas meter (54), first pipeline is connected in metering device's storage water tank (51), gas meter (51) are connected in third pipeline (52), second pipeline (7) are connected in water storage tank (54) of metering device, gas meter (54) are provided with to water storage tank (51).
2. The high negative pressure pipeline gas extraction metering device according to claim 1, wherein the diversion pipe fitting comprises a diversion pipe (31), an iron plug connector (32), a first rubber plug connector (33), a second rubber plug connector (34) and a diversion pipe valve (35), wherein the iron plug connector (32) is sealed and positioned above the first rubber plug connector (33), the diversion pipe valve (35) is positioned between the first rubber plug connector (33) and the second rubber plug connector (34), the first rubber plug connector (33) is connected with the first pipeline (6), and the second rubber plug connector (34) is connected with the second pipeline (7).
3. The high negative pressure pipeline gas extraction metering device as claimed in claim 2, wherein the telescopic valve sleeve (4) comprises a first valve sleeve (43), a second valve sleeve (44), a first screw (45), a second screw (46) and a sleeve (47), wherein an internal thread (48) is arranged in the sleeve (47), the first valve sleeve (43) is integrated with the first screw (45) and is connected to the upper end of the sleeve through the first screw (45), the first valve sleeve (43) is connected with a first valve (41) positioned on a first pipeline, the second valve sleeve (44) is integrated with the second screw (46) and is connected to the lower end of the sleeve through the second screw (46), and the second valve sleeve (44) is connected with a second valve (42) positioned on a second pipeline.
4. The method for using the high negative pressure pipeline gas extraction metering device is characterized by comprising the following steps of:
firstly, checking whether water exists in a water storage tank (51), opening a water discharge valve (56) of the water storage tank, if water flows out of the water storage tank (51), waiting for the water in the water storage tank (51) to be discharged, and closing the water discharge valve (56) of the water storage tank; if no water flows out of the water storage tank (51), a water discharge valve (56) of the water storage tank can be directly closed;
closing the first valve (41) and the second valve (42), connecting the first pipeline (6) with the first rubber plug connector (33), and connecting the second pipeline (7) with the second rubber plug connector (34);
thirdly, a first valve sleeve (43) of the telescopic valve sleeve (4) is connected with the first valve (41) in a matched mode, a second valve sleeve (44) is connected with the second valve (42) in a matched mode, so that the telescopic valve sleeve (4) can simultaneously control the opening and closing of the first valve (41) and the second valve (42), and the telescopic valve sleeve (4) can be stably installed by means of the telescopic action of a first screw (45) and a second screw (46) in a sleeve (47) and the adjustment of the distance;
fourth, the flow guiding pipe valve (35) is closed, the middle part of the telescopic valve sleeve (4) is held by hands, and the telescopic valve sleeve is slowly rotated, so that the first valve (41) and the second valve (42) are simultaneously opened, the air flow in the drilling hole passes through the first pipeline (6), the water storage tank (51) is provided, if water is contained in the air flow, when the air flow flows through the water storage tank (51), the water in the air flow is settled in the water storage tank (51) due to the action of gravity, and the air flow becomes anhydrous air flow, and then returns to the flow guiding pipe through the third pipeline (52) and the gas meter (54) through the second pipeline (7);
fifthly, observing the reading of the gas meter and the gas meterAfter stabilization of the rotor rotation, an initial reading x is recorded 1 Simultaneously, the stopwatch is started, the recording time is 5min, and at the moment of 5min, a final reading x is recorded 2 Thus, the gas extraction amount (m) in the negative pressure pipeline can be calculated 3 /min), namely (x) 1 -x 2 )/5；
Step six, after the test is finished, the middle part of the telescopic valve sleeve (4) is held by hands and slowly rotated, so that the first valve (41) and the second valve (42) are closed simultaneously, the connection between the first pipeline (6) and the first rubber plug connector (33) is opened, the connection between the second pipeline (7) and the second rubber plug connector (34) is opened, the first rubber plug cover (38) is covered on the first rubber plug connector (33), and the second rubber plug cover (39) is covered on the second rubber plug connector (34);
seventh, the flow guide pipe valve (35) is opened, at the moment, air flow directly enters a main pipe of the gas extraction system from the gas extraction pipe, the valve (56) of the water storage tank is opened, water in the water storage tank is discharged, and then the valve (56) of the water storage tank is closed for the next standby.
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| CN201710922998.4A CN107701221B (en) | 2017-09-30 | 2017-09-30 | High negative pressure pipeline gas extraction metering device and use method thereof |
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| CN201710922998.4A CN107701221B (en) | 2017-09-30 | 2017-09-30 | High negative pressure pipeline gas extraction metering device and use method thereof |
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| CN109372570B (en) * | 2018-10-08 | 2020-05-19 | 淮南矿业(集团)有限责任公司 | Control method and device for extraction system |
| CN111119979B (en) * | 2019-12-08 | 2021-12-03 | 山西晋煤集团技术研究院有限责任公司 | Small-flow gas extraction drilling hole accurate measurement system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201043906Y (en) * | 2007-06-15 | 2008-04-02 | 郑州煤炭工业(集团)有限责任公司 | Bridge type single-hole orifice plate flowmeter |
| CN201522299U (en) * | 2009-09-18 | 2010-07-07 | 中国矿业大学 | Device for measuring gas extraction flow |
| CN102261241B (en) * | 2010-05-25 | 2013-11-20 | 淮南矿业(集团)有限责任公司 | Device and method for measuring signal hole in mine gas extraction system |
| CN102928034A (en) * | 2011-08-10 | 2013-02-13 | 淮南矿业(集团)有限责任公司 | Method and device for metering gas during extraction |
| CN202216723U (en) * | 2011-08-10 | 2012-05-09 | 淮南矿业(集团)有限责任公司 | Gas extraction metering device |
| CN202166441U (en) * | 2011-08-13 | 2012-03-14 | 四川新明塑业有限公司 | Improved gas flow measuring device |
| CN102828769B (en) * | 2012-09-20 | 2014-08-20 | 中煤科工集团重庆研究院 | Complete oil receiving, pumping and conveying device for pumping and extracting mine gas |
| CN203430573U (en) * | 2013-07-30 | 2014-02-12 | 河南煤业化工集团研究院有限责任公司 | Portable coal mine underground gas extraction parameter detection device |
| CN203719713U (en) * | 2014-01-16 | 2014-07-16 | 中国矿业大学(北京) | Tracing gas method pipe gas flow measuring device |
| CN205958036U (en) * | 2016-07-25 | 2017-02-15 | 中国石油化工股份有限公司 | High pressure and high temperature natural gas elbow meter |
| CN207686756U (en) * | 2017-09-30 | 2018-08-03 | 河南理工大学 | A kind of high negative pressure pipeline gas extraction metering device |
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Inventor after: Wang Zhaofeng Inventor after: Tu Dongping Inventor after: Yue Jiwei Inventor after: Zhang Jianguo Inventor after: Chen Jinsheng Inventor after: Lv Youchang Inventor after: Li Haowei Inventor after: Sun Juzheng Inventor after: Chen Xien Inventor after: Wang Long Inventor before: Wang Zhaofeng Inventor before: Tu Dongping Inventor before: Yue Jiwei Inventor before: Zhang Jianguo Inventor before: Chen Jinsheng Inventor before: Lv Youchang Inventor before: Li Haowei Inventor before: Sun Juzheng Inventor before: Chen Xien Inventor before: Wang Long |
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